Arduino based garage door trigger
From EmbeddedSand
Contents |
Hardware
- Fully compatible with the the Arduino Uno, the Etherten includes an ethernet module based on the Wiznet chip used in the official Arduino shield. Of course you could use an Uno + Ethernet shield for this project but the Etherten costs less than buying the shield and Uno separately.
- A relay
- The relay works in parallel with the internal switch that activates the garage door opener. You'll need to follow the wiring for your own internal switch to see whether it is normally open or normally closed and configure the relay appropriately. Make sure the relay is rated appropriately.
- Wire the relay to digital output number 7 on the Etherten. If you use a 5V relay that draws less than 40 mA, you can drive it directly from the Arduino output. Otherwise drive the relay with a transistor. Be sure to put a diode across the coil so the reverse EMF doesn't destroy the output driver on the Arduino board.
- A custom 3D printed case designed in Blender and printed using a powder based 3D printing technology. If your interested the printer we used can be found here ZPrinter-150.
Arduino Code
The fantastic Webduino library is used to implement the garage door web-server on the Arduino. The current time for logging access is maintained by our Clock library. You can download the complete Garage door opener project. We'll look at the key sections below.
Entry Page
The first page users see when visiting the Arduino webserver is the index page where they are prompted for a password.
This page is generated by the helloCmd function. It is registered with the webserver as part of the setup function:
webserver.setDefaultCommand(&helloCmd); // when root page is accessed. webserver.addCommand("index.html", &helloCmd); // if index.html is accessed explicitly.
The helloCmd generates a simple web form that prompts the visitor for their password:
void helloCmd(WebServer &server, WebServer::ConnectionType type, char *url_tail, bool tail_complete) { // Login screen cancels grace period s_bUnlocked = false; /* this line sends the standard "we're all OK" headers back to the browser */ server.httpSuccess(); /* if we're handling a GET or POST, we can output our data here. For a HEAD request, we just stop after outputting headers. */ if (type == WebServer::HEAD) return; server.print("<html><head><title>Gateway</title></head><body>\n"); switch (type) { case WebServer::GET: server.print("<form action='LetMeIn.html' method='POST'>"); server.print("<p> Speak friend, and enter: </p>"); server.print("<p> <input type='text' name='message' autocomplete='off' /> "); server.print("<input type='submit' name='send' value='Go'/> </p>"); server.print("</form>"); break; case WebServer::POST: default: server.print("<p>Unknown request</p>"); break; } server.print("</body></html>"); }
Password Validation
void validateCmd(WebServer &server, WebServer::ConnectionType type, char *url_tail, bool tail_complete) { URLPARAM_RESULT rc; char name[NAMELEN]; int name_len; char value[VALUELEN]; int value_len; /* this line sends the standard "we're all OK" headers back to the browser */ server.httpSuccess(); /* if we're handling a GET or POST, we can output our data here. For a HEAD request, we just stop after outputting headers. */ if (type == WebServer::HEAD) return; if (type != WebServer::POST) { server.print("<html><head><title>Gateway</title></head><body><p>Sorry, you are not welcome here.</p></body></html>"); return; } // Validate the password, if one was supplied. An invalid // password will cancel the lock period, but a missing // password will not (otherwise we'd need a different page, // to handle that). if (type == WebServer::POST) { while (server.readPOSTparam(name, NAMELEN, value, VALUELEN)) if (strcmp(name, "message") == 0) { // An invalid password will reset grace period s_bUnlocked = strcasecmp(value, "arduino") == 0 || strcasecmp(value, "freetronics") == 0 || strcasecmp(value, "megunolink") == 0; s_lLastUnlocked = millis(); } } server.print("<html><head><title>Gateway</title></head><body>"); if (s_bUnlocked) { server.print("<p>Welcome</p>"); server.print("<form action='LetMeIn.html' method='POST'>"); server.print("<input type='submit' name='send' value='Activate Door'/> </p>"); server.print("</form>"); server.print("<form action='index.html' method='GET'>"); server.print("<input type='submit' name='Lock' value='Lock'/> </p>"); server.print("</form>"); } else server.print("<p>None shall pass!</p>"); server.print("</body></html>"); if (s_bUnlocked) ActivateDoor(); }
Activating the Door
The simplest part of all: activating the door. The relay is closed for a short time and the message written to the serial port. Capturing the serial message with MegunoLink provides a simple access log.
void ActivateDoor() { Serial.write("Door activated "); g_Clock.WriteDateTime(&Serial); Serial.write('\n'); digitalWrite(PIN_LED, HIGH); // set the LED on digitalWrite(PIN_DOOR, HIGH); // Open door. delay(600); digitalWrite(PIN_LED, LOW); // set the LED off digitalWrite(PIN_DOOR, LOW); // Door will continue to open by itself. }
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Comments
Crs said ...
12:07, 4 August 2012 (MDT)
Nice work I wonder whhteer the Gameduino would work on the ChipKit boards (32-bit and faster than Arduino, but sorta compatible). I might have to check that out.
jordan retro 3 said ...
22:29, 1 November 2012 (MDT)
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